Screw-cut



7 Sheets-Sheet 1.

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A. METT'LER. 4SCREW CUTTING MACHINE.

No. 587,898. Patented Apr. 28, 1895.

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(No Model.) 7 Sheets-Sheet 2.

A. MB-'I'TLER- SCREW CUTTING MACHINE. No. 537,898. Patented Apr. Z8, 1895.

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(No Model.) 7 Sheets-Sheet 3.

A. METTLER. SGREW CUTTING MACHINE.

No. 537,898. Patented Apr. 23, 1895.

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(No Model.) 7 Sheets-Sheet 4.

A, METTLER. SCREW CUTTING MACHINE.

No. 537,898. PatentedApr. 2s, 1895.

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(No Model.) 7 Sheets-Sheet 5.

A. METTLER. SCREW CUTTING MACHINE.

No. 537,898. PatentedApr. 23, 1895.

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(No Model.) 7 Sheets--SheetJ 6. A. METTLER.

SCREW' CUTTING MACHINE.

Patented Apr. 23

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(No'Moael.) 7 sheets-sheen 7.

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No. 537,898.- PatentedApr. 23, 1895'.

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ADoLE METTLER, or HARTFORD, CONNECTICUT, AssiGNoR, BY MEsNE ASSIGNMENTS, TO THE SPENCER APANY, or SAME PLACE;

'i SCREW-CUTTING MACHI AUTOMATIC MACHNE SCREW COM- se-ECFIcArIoN forming part of Letters Patent No. 537,898, dated April 2e, 1895.

Applica@ tied Augiisf. 13, 1894.'

To all whom t may concern:

Be it knownthat I, 'ADOLB` METTLER, o Hartford, in the county of Hartford and State of Connecticut, have invented a new and Improved Screw-Cutting Machine, of which the following is a full, clear, and exact description.

The invention relates to screw cutting machines, such as shown and described in Letters Patent of the United States No. 513,334, granted to Caspar W. Mettler on the date of January 23, 1894.

The object of the invention is to Lprovide a` new and improved screw cutting machine designed for forming slotted head and other screws in a very rapid and economical manner.

The invention consists in certain parts and details, and combinations of the same, aswill behereinafter fully described and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters and figures of reference indicate corresponding parts in all the views.

Figure lis a side elevation of the improvement. Fig. 2 is a plan view of the same. Fig. 3 is a rearelevation of the head-slotting device. Fig. 4 is a lower end view of part of the improvement. Fig. 5 is a sectional side elevation of the improvement. Fig. 6 is a perspective view of the cam for the return movement of the feed carriage. Fig. 7 is a like View of the cam for the forward movement of -the feeding device. Fig. 8 is a similar view of the cam for actuating the tapping mechanism. Fig. 9 is a transverse section of the improvement on the line 9-9 of Fig. 1. Fig. 10 is a similar view of the same, on the line 10--10 of Fig. 1. Fig.11 is an upper end view of the improvement,`with the cam shaft in section. Fig. 12 is an enlarged sectional plan view of part of the stock-feeding device and adjacent parts, the section being taken on the line 12-.12 of Fig. 5. Fig. 13 is an enlarged sectional side elevation of the stock feeding de-` vice. Fig. 14 is a similar View of the same,

'with parts in a different position. Fig. 15 is serai No. 520,204. (No model.)

an enlarged sectional side elevation of' the ,screw tapping "device Fig. 16 is a similar view ofthe same, with parts in a different posi- 4tion. Fig. 17 isa sectional side elevation of .part of the same previous to the tapping of the screw shank. Fig. 18`is an enlarged sectional side elevation of the device for remov- ,ing the tapped screw from the stock and holdingit for slotting. Fig. 19 is a like View of the sarne in position for slotting the head of the screw. Fig. 2O is atransverse section of part of the tapping device, on the line 20-20 of Fig. 16. Fig. 21 is a like view of part of the 4tapping device, on the line 21-21 of Fig. 15. Fig 22 is an enlarged sectional side elevation of the spindle and adjacent parts; and Fig.v `23 isa transverse section of the same. l The improved screw cutting machine is provided with a suitably constructed frame A, in which is journaled the longitudinally-extending cam shaft B, carrying at one end a worm wheel B in mesh with a Worm BZ formed on the transverse-extending driving shaft B3, `journaled in suitable bearings in the upper end of the main frame A. A clutch B4 is adapted to connect the driving shaft BS with a cone pulley B5 connected by a belt with suitable machinery for imparting a rotary motion to the said driving shaft B3, the worm B2, worm wheel B and cam shaft B, as long as screws are `cut from the stock in the machine. On the cam shaft B, near the upper end of the main frame A, is secured acam C, adapted to im part the necessary motion to the feeding device, for moving the stock at intervals for the formation of the screw, as hereinafter more fully described. to actuate a lever C', fulcrumed on the main frame A, and operating with its free end between the lugs C2 and C3 formed on a slide C4, mounted in suitable bearings and provided with a set screw C5 adapted to abut on a second slide CG, likewise carrying a set screw C7 adapted to abut ou a slide C8, in which is journaled the sleeve D, containing a second sleeve D' through which passes the rwire rod E, forming the stock from which the screws are cut.

The cam C is adapted sys The inner end of the sleeve D is split, and made with a conical head D2, see Fig. 22, adapted to engage the slightly beveled inner end of the sleeve D to close the said split head of the sleeve D whenever the latter is pushed rearward, so as to firmly grip the stock E and securely hold the same in position while undergoing turning, tapping and other operations hereinafter more fully described. Near the outer end of the sleeves D, D is held a collar D3 fitting into an enlarged recess inthe sleeve D and having offsets D4 fitting into longitudinally extending slots D5 formed in thesaid rear end of the sleeve D. See Figs. 13, 22 and 23. A clutch collar DG having a conical or'beveled end is held on the slotted end of the sleeve D and is engaged by the forked end of the slide C6 so as to move longitudinally with the latter and still be free to turn with the sleeve.

The clutch collar D( is adapted to operate l a set of levers D7 held on a collar D8 and adapted to engage the offsets D4 so that when the said clutch collar D( is moved inward by a like movement of the slide C6, the said levers are actuated and the collar Ds is moved outward to cause a sliding of the sleeve D rearward to move the split head D2 in engagement with the sleeve D so as to fasten the stock E in position in the said sleeve D. At the time this takes place the Set screw C7 has moved against the slide C8, so that on the further action of the cam on the lever C', the latter moves the slides C4, C6 and C8 inwardly, to shift the sleeves D and D together with the gripped stock E, so as to feed the latter forward for the formation of a screw. The slide C4 is fitted to slide longitudinally in suitable bearings on the slide C6, and the latter is fitted to slide in suitable bearings on the slide C8, and this latter slide is fitted to slide in suitable bearings in the top plate A' of the main frame A.

The levers DT are fulcrumed in the collar D8 secured on the sleeve D, as plainly shown in the drawings. The lever C is adapted to be acted on by the cam C in the following manner: First, the inclined part 1, of cam C engagesthe end of the lever C', to move the latter a sufficient distance to cause the split end D2 of sleeve Dl to close upon the stock E as previously described, to grip the same, and then the part 2 of the cam C acts on the lever C,to push the several slides connected with the lever forward, to feed the stock E a sufficient distance for forming the screw, and then the lever C passes into a notch 3, to temporarily shift the stock E rearwardly, to disengage the cutters for' forming the shank. Next, the cam C at the cam surface 4, shifts the lever C for feeding the stock E again inward, for forming the head of the screw, and then the cam drops off at 5, on the end of the lever C', to permita return movement of the several slides forming the feed for the stock. This return movement is accomplished by a cam C9 secured on the cam shaft B, next to the cam C, and adapted to act on a rod C40 secured to the slide C8, as plainly shown in the drawings.

' The cam C9 (see Fig. 6) is provided with the inclined cam surface 6, adapted to act on the rod C40, to push the slide C8 outward after ascrew has been cutoff from the stock. Then the rod C40 drops into a notch 7, to be then engaged by a nose 8, so as to move the stock in an inverse direction a short distance, for releasing the stock from the sleeve D', to again permit a forward feeding of the stock as previously described, by the action of the cam C on the lever C. A rotary motion has `t0 be given to the stock E in opposite directions,during the formation of each screw, and for this purpose the sleeve or hollow spindle F fitted over the sleeve D and journaled in suitable bearings A2 is provided with a longitudinal slot or keyway to receive a key D9 on the sleeve D. On this sleeve F are secured the two pulleys F4 and F5, between which is held a loose pulley F, as plainly Shown in Fig. 5. A belt G normally enga-ges the pulley F4, while a second belt G engages the loose pulley F, the said two belts G and G being, however, adapted to be shifted simultaneously byshifting arms G2 and G3 respectively, held on a shifting arm G4 forming part of a shifting lever G5 fulcru med on the main frame A, and carrying a friction roller G6, adapted to be actuated from a cam G7 secured on the cam shaft B. New when the said cam G7 actuates the lever G5, the belts G and G are simultaneously shifted from the pulleys F4 and F4i respectively, to the pulleys F6 and F5 respectively, whereby the belt G now becomes the driving belt. The belt G4 is driven in the reverse direction to belt G or it may be a crossed belt which rotates the spindle F in an inverse direction to that previously given to it by the belt G at the time the latter was in engagement with the pulley F4. This shifting of the belts is necessary to rotate the stock in an inverse direction to unscrew the tapped screw from the tap as hereinafter more fully described, and then after the cam G7 has been disengaged from the lever 15 the belt shifting lever G5 is again returned to its original position by the retracting spring G5X so as to move the belts Gand G back to their normal positions shown in Figs. 1 and 5, to cause the spindle F to again rotate from the left td the right.

1n order tolimit the return movement of the slides and also to determine the length of the head of the screw to be formed, Iprovide the slide c8 with a transversely-extending arm H (see Figs.12, 13 and 14) adapted to engage the curved end H of a lever H2fulcrumed on the top A and adapted to engage a pin H3 projecting upwardly from a slide H4 mounted to slide transversely in suitable bearings in the upper end of the main frame A. On this slide I14 is arranged a boss H5, adapted to move opposite a screw H6 screwing in the slide C8, the said boss being also adapted to engage a set lIO IZO

Y, Y Y A screw H7 screwing in an arm Hs pivoted on the front end of the slide C5, said arm H8 being pressed on by a spring H6. The return movement of the slide H4 is accomplished by a spring H16, connecting the said slide with a staple on the frame A. Now when the slide C6 moves inward, then the arm H finally engages the curved inclined end H of the lever H2, so that the latter shifts the slide H4 to the front against the tension of the spring H16, to cause the screw H7 to strike or butt on the boss H5 as soon as the slide C6 comes back from threading,'and to hold the slide CB and stock or wire E in position until the screw is cut o. Then the slide C8 will move inward a short distance and the slide H4 will be pulled back by the spring H46, and then the slide C6 comes back for the stock and the boss H5 will reston the screw H6.

In order to automatically stop the machine when the end of the wire or stock E has passed into the clamping sleeve D', I provide a lever I, fulcrumed at 1 to the upper end of the frame A, (see Fig. ll) and extending in an inclined direction, with the upper end of the lever resting loosely against one side of.. the stock E. The lower end of lever 1 is adapted to rest on the free end of a spring l2, having a depending bent end l5 pivoted to the frame A as seen in Figs. 1l and l2, said bent end 15 of the spring engaging a notch 16 formed in one side of a slide-rod 16 longitudinally movable transversely of the frame A, and connected at its extremity to a clutch-lever B7, engaging the movable member B4 of the clutch which drives the shaft B3 from its cone-pulley B5. The lever B4 is provided with a retracting spring 1T arranged to hold said member B4 normally away from the pulley B5, but when the stock E has been arranged in position the rod 16 will be pushed over until the end I5 of spring l2 engages with the notch 16 in` the slide rod 16 when the parts will be held for the time being in that position. The spring 12 carries a tooth or block 14 adapted to engage between the threads of a screw or worm B6 mounted on shaft B, but when the end of the spring l2 is in engagement with the lower end of rod or lever I, said tooth 14 is held out of engagement with the worm B6. When the lever I is allowed to fall, by the passage of the end of the stock E, said spring 12 is released and rises by its resiliency so as to engage its tooth with the threads of the worm B6. The spring I2 has a pin 13 which works in a slot l8 formed in the slide rod 16 and said spring when its tooth is engaged by the rotating Worm B6 turns on said pin l3 as a pivot whereby its opposite end 15 is moved slightly laterally out of engagement with the notch in slide rod 16 whereby the spring l7 is permitted to actuate the lever BT toI disengage the movable member B4 of the clutch from the member on pulley B5, and the machine is consequently stopped. The stock E, after leaving the end of the clamping sleeve D', passes to a bushing K, fastened in place by a set screw K in a bushing K2 secured in the front K3 of the tool casing K4 supported on the top A of the main frame A, as plainly shown in Figs. 1, 2 and 5. (See also Figs. 9, 'l0 and ll.) The bushing K is held removably in the bushing K2, to permit the operator to use different sized bushings for different sized stock to be formed into screws. On the front end of the bushing K, operate the cutting tools L and O, for reducing the stock to form the shank of the screw, and also the cutting tools N and P, for cutting oii the screw after the head is formed, andV after the shank is tapped as hereinafter more fully described. The cutters L and Nstand at angles to each other and hold the stock securely in position as will be understood, and the said cutters are held by set screws L and N respectively in the two holders L2 and N2 respectively, held adjustably on slides L3 and N5 respectively, titted to slide in suitable guideways formed in the tool casing K4. (See Fig. 10.) The slides L3 and N3 are held normally in an outermost position so as to hold the cutters L and N ont of cutting contact with the stock, by means of springs L4 and N4 respectively, attached to the tool casing K4. The slides L6 and N3 are pressed inwardly against the tension of their springs L4 and N4 respectively, by arms L5 and N5 respectively, fitted to slide on the slides Lsand N6, and provided with set screws for regulating the contact of the said arms L5, N5, with their slides L6, N6. Cam arms L6, N6, respectively are pivotally connected with the said arms L5, N5, respectively, and are adapted to be actuated by cams L7, N7 respectively, secured on the cam shaft B. The other cutters O and P extend approximately on opposite sides of the stock E, as plainlyshown in Fig. 9, and the said cutters are held adjustably in tool holders O and P respectively, attac-hed to arms O2 and P2 respectively held adjustable on slides O3 and P5 respectively (see Fig. 10) held normally in their outermost position by springs O4 and P4, respectively, attached to the inside ofthe casing K4, as shown in the said Fig. l0. The arms O2 and P2 are provided with transversely extending guide arms O5 and P5 respectively, connected with the levers O6 and P6 respectively fulcrumed on the tool casing K4, and adapted to be actuated by cams O5and P7 respectively,secured on the cam shaft B. Nowit will be seen that the cams L7 and O7 operatein unison to simultaneously move the cuttersL and O in engage ment with the stock, to reduce the latter so as to form the blank shank E (see Fig. 17) on the end of the stock projecting beyond the bushing K, as the said stock is fed inwardly by the action ofthe cam Cas previouslydescribed. The other cutters N and P likewise operate in unison, and are actuated simultaneously from their cams N7 and P7, so that the stock is cut after the shank is threaded as hereinafter more fully described, to form the head E5, by making a cut E4 in the stock at the end of the bushing K. `See Fig. 16.

IOO

IIO

The cutters L, N, O and P are held adjustably in the devices described, so as to permit the operator to conveniently and properly set the cutting edges of the tools relative to the motion imparted to the tools by the actions of the cams, to reduce the stock to form the proper sized shank, and also to cut the stock to form the head without entirely cutting off the screw, as shown in Fig. 16, for the purpose hereinafter more fully described.

On the tail end of the main frame A, and on the top A" is formed a transversely-extending guideway A3, in which is fitted to slide a carriage Q, supporting a longitudinally eX- tending drill shaft R, adapted to carry a drill x for boring acentral hole in the screw to be formed, as hereinafter more fully described, the said carriage also supporting a die shaft S, adapted to supporta die S', for cutting the thread on the reduced end of the stock, and on the said carriage is further mounted a holder T, adapted to take hold of the threaded shank, to break off the screw from the shank and to move it to the head-slotting device hereinafter more fully described. Normally, the carriage Q stands in the position shown in Fig. 2, that is, with the drill shaft R in alignment with the stock, and in order to successively move the die shaft S and the holder T in alignment with the stock, l provide a mechanism for imparting this motion to the carriage. On the under side of the carriage is pivoted a lever Q', fulcrumed on the main frame A, and adapted to be actuated from a cam Q2 secured on the cam shaft B, and pro vided with two cam surfaces Q3 and Q4, of which the former, in acting ou the lever Q', moves the carriage to the frontin the direction of the arrow a' (see Fig. 2), until the die shaft S is in alignment with the stock. The other cam surface Q4 next engages the lever Q' so as to impart a further movement to the carriage Q in the direction of the arrow 0,' and until the holder T is in alignment with the stock E. ln order to impart a return movement of the carriage Q in the inverse direction of the arrow a', I connect the rear end of the said carriage with achain Q5 passing over a pulley Q6 journaled on the main frame A, the said chain Q5 then hanging downward and carrying at its lower end a weight Q7, sufficiently heavy to return the carriage Q after the cam surface Q4 leaves the end of the lever Q'. A stop Q8 held on the front end of the carriage serves to limit the rearward movement of the carriage Q, by the stop abutting against the front edge of the guideway A5.

The drill shaft R, the die shaft S, and the holder T, are adapted to be acted on when in alignment with the stock by .a lever U, fulcrumed at U' on a sleeve U2 collared on the cam shaft B. This lever U is provided with a projection U5 (see Fig. 5) adapted to be acted on by a cam U4, secured on the cam shaft B, and provided with cam surfaces U5 and U6, adapted to engage the said projection U3 so as to impart a swinging motion to the lever U, in the direction of the arrow b', to actuate the shafts previously mentioned in the manner hereinafter more fully described. The drill shaft Ris provided at its front end with a socket R', adapted to carry the drill for boring au aperture through the screw to be formed, whenever such form of screw is desired. If ordinary screws are desired to be made, then no drill is inserted in the socket R', and consequently no aperture is bored in the screw.

The rear end of the shaft R is reduced and threaded to engage a nut R2, adapted to be acted on by the upper end of the lever U, to impart a forward sliding motion to the said shaft R, to move the drill in contact with the screw-blank, so that the rotation of the latter causes a boring of a hole inthe blank on the forward feeding of the said shaft R. The return movement of the shaft R is caused by a spring R3 coiled on the shaft and held in one of the bearings for the shaft, as indicated in Fig. 2. The inner end of the spring R3 abuts against the bearing, and its outer end against a pin R4, held in the shaft- R.

The die shaft S (see Figs. 15, 16 and 17) is provided with a socket adapted to carry the die S', for cutting the thread on the reduced end of the stock E. This die S' is held in place in the socket `by a set screw S2, and can be readily changed'according to the size of the screw to be made. The rear end of the shaft S is provided with the reduced threaded portion S5, on which screws a nut S4 adapted to be engaged by the lever U, so as to move the shaft S longitudinally, to bring the die S' onto the reduced end to cut the threads thereon, it being understood that during this operation the stock E is clamped in the sleeve D', and rotated by the spindle F as previously described. The return movement of the shaft S is accomplished during the time the stock E is rotated in an opposite direction at the time the belts G and Gr are shifted as previously described, and this return movement of the shaft S is accomplished by a spring S5 acting on the shaft in one of its bearings, as shown in Figs. l5 and 16. One end of the spring S5 rests on the said bearing, and its outer end on a pin S6 held on the said shaft S.

While feeding the shaft S inward to tap the screw shank, the said shaft S is prevented from turning, and for this purpose I provide a sleeve S7, held in place on the. carriage Q by a set screw S8. This sleeve is concentric to the shaft, and is provided with a forwardlyprojecting slotted tongue S9, engaging a pin S10 secured on the shaft S. Now as long as the pin S10 is in engagement with the said slotted tongue, the shaft cannot revolve, but as soon as the lever U has moved the shaft S forward to finish threading the shank, then the pin S10 leaves the slotted tongue S9, as indicated in Fig. l5. The shaft S can now revolve with the stock E during the time the shifting of the belts G' and G takes place, and when IOO IIO

I s A l I this has been accomplished, the shaft is again locked in place by a collar S11 secured on the shaft, and formed with a shoulder S12 adapted to be engaged by a spring-pressed arm S13 held on the carriage Q. See Fig. 21. Thus when a turn has been made by the shaft S, the said spring-pressed arm S13 engages the shoulder S12, and consequently prevents further rotation of the shaft S, the latter then standing with its pin S10 in alignment with the slot in the tongue S9. The spring S5 compressed on the inward movement of the shaft S, now causes a return movement of the shaft, and a consequent unscrewing of the threaded shank E2 from the die S on the revolving of the stock E in the inverse direction. After the die S leaves the threaded shank the carriage Q is again shifted in the direction of the arrow ct', so as to bring the holder T in alignment with the screw. During the shifting of the carriage in the direction indicated, the cutters N and P cut the stock E to form the head of the screw, a small portion being left standing to connect the screw with the stock, as shown in Fig. 18. When this has been done, the cutters recede, and the holder T is now advanced to engage the shank of the screw, to break the latter olf from the stock and to -carry it transversely in the inverse direction of the arrow a', to slot the head of the screw. This holder T and the mechanism for operating the same is shown in detail in' Figs. 18 and 19, and is preferably made square in cross section and iitted to slide longitudinally in the slide T', having a longitudinal move- .ment in the carriage Q, this double movement being necessary to first engage the holder with the screw, and then to feed the screw to the slotter, as hereinafter more fully described. In the front end of the holder T is secured a head T2, by means of a set screw T3, and this head is formed with an aperture of the size of the threaded shank of the screw to engage the latter.y The head T2 is changed according to the size of the screw to be finished.

In the rear end of the holder T screws a screw T4, adapted to be engaged by the lever Upreviously mentioned, so as to impart a sliding motion to the said holder, to move the head T2 in engagement with the threaded shank of the screw at the time the said holder is in alignment with the stock, as previously described. See Fig. 1S. The holder T is prol vided within the slide T with the reduced portion T5, on which is coiled a spring T6, resting with one end against a shoulder on the holder T and at its other end on lugs T7, forming part of the slide T. Thus after the holder T has been moved in engagement with the threaded screw, and the carriage Q has been moved sidewse, to cause a breaking off of the screw on the stock E, then at the same time the screw T11 moves off the lever U, and the previously compressed spring T6 moves the holder T outward into its original position, the outward movement being limited by the lugs T7. (See Fig. 19.) The carriage Q now of the cone B5.

continues its lateral movementin the inverse direction of the arrow ct', and until the stop Qs rests against the guideway A2, as previously described. y

ln the rear side of the slide T and the holder T, are formed registering slots TB, adapted to be engaged by the upper end of a lever W, at the time the carriage Q moves in its outermost position. This lever W is ful crumed at W to the main frame A, and its lower end is adapted to be acted on by a cam W2 secured on the cam shaft B, and having a single cam surface W2. A spring W1 held on the main frame A, connects with the lower end of the said lever W, to move the latter back into its normal position after the cam surface 'W3 has passed the said lever. When the carriage Q stands in its rearmost position, then the center of the holder T is in alignment with a circular cutter V, so that when the holder is no w moved forward by the action of the lever W on the slide T and holder T, the head of the screw is moved in contact with the cutting edge of the cutter V, so that the head is slotted, it being understood that the depth of the slot is regulated by the cam surface W2 acting on the lever WV, for feeding the holder T forward. This cutter V is secured on a transversely-extending shaft V, mounted to turn in suitable bearings in a bracket V2 held vertically adjustable in a bracket V3 held longitudinally adjustable on the main frame A, as plainly shown in Fig. 19. On the rear end of the shaft V is secured a pulley V1, connected by a cross belt V5 with a pulley B8 forming part On the top of the bearing for the holder T, is secured a push rod T10, ex-

IOO

tending into a recess T2 formed in the top of the holder T, and engaging with its forward end a central aperture in the head T2, so that when the slide T, with the holder T, recedes by the action of the spring WW on the lever W, then the said push-rod engages the slotted screw and pushes the latter out of the head T2, whereby the screw is discharged to one sideV of the machine in a'finished condition.

When the several parts are in the position illustrated in Figs. 1, 2 and 5, then the belt Gr drives the spindle F in which is splined the sleeve D, carrying sleeve D', holding the stock E, and the said sleeve D is now fed forward by the action of the cam C on the lever C', as previously described, whereby the front end of the stock E is passed through the bushing K a distance corresponding to the length of the screw to be made, this distance being regulated bythe screw C7. During the forward movement of the stock the drill shaft R is advanced by the action of the lever U, so that in case a drill is carried by the said shaft an aperture is bored into the en'd of the stock projecting beyond the bushing K.

At the time the stock is fed forward and passes out of the bushing K, the cutters L and O are moved radially inward by the action of f end of the stock is reduced and the shank for the screw is formed. Vhen this has been done, the lever Q of the carriage Q is acted on by its cam Q2, to shift the carriage forward to bring the die shaft S in alignment with the screw. Then the lever U, being acted on by the cam surface U6 of the cam U4, causes a sliding of the said die shaft S, to engage the die S with the blank end E of the stock E, to cut the thread thereon, as illustrated in Fig. 15. The `shifting of the belts G, G,now takes place by the action of the cam G7 on the shifting lever G5 as previously described, so that a reverse movement is given to the stock E, to cause the threaded shank E2 to unscrew from the die S, which with the die shaft S is held in a fixed position by the action of the springpressed arm S13 engaging the shoulder S12 of the collar S11. The spring S5 then causes a rearward sliding of the die shaft S, and at the same time an outward feeding of the stock E takes place by the ac tion of the cam C on the lever C', whereby the stock is left projecting beyond the sleeve K, a distance to form thehead E2. See Fig. 16. The other cutters N and P now advance by sliding radially inward to cut the slot E4 to form the head E3 as previously described, and when this has been done, the carriage Q again moves in the direction of the arrow a', to bring the holder T in alignment with the screw, to engage the same by the action of the lever U on the said holder, and then by a transverse movement of the carriage Q in the inverse direction of the arrow a', to break off the screw from the end of the stock E. The holder T is then returned to its normal position, and likewise the carriage Q, so that the lever W engages the holder and slide, to move both simultaneously forward, and the head of the screw in engagement with the cutter V. The latter now cuts or forms the slot in the head of the screw, after which the slide and holder move backward and the push rod T10 forces the finished screw out of the head T2, and thus the finished screw is delivered to one side of the machine. operation is then repeated, that is, the stock is again fed forward, the projecting end reduced, the thread is out thereon and then the head is formed, after which the screw is broken off from the shank and moved to the cutter for forming a slot in it, and if desired,an aperture may be bored in the screw by inserting a suitable drill in the drill shaft R, as above described. After the entire wire or rod forming the stock has passed into the machine, then the lever I, drops off the stock as the latter passes into the sleeve D', whereby the spring lever I2 is released and the thread B11 imparts a swinging motion to the said lever, to move the end I5 thereof out of engagement with the notch in the shifting bar I, so that the spring I7 pulls on the clutch shifter B7, and moves the clutch B4 out of engagement with the cone pulley B5, whereby rotary motion of the main driving shaft B3 and the cam The above described shaft B ceases. The machine is thus brought to a standstill, and remains so until new stock is put into the sleeve D', and the lever I moved back to its position against the stock, and the clutch B4 again connected with the cone B5.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a screw-cutting machine, the combination of a stock sleeve, a slide in which said sleeve is mounted to turn, a clutch and levers for imparting a sliding movement to said sleeve, a second slide slidingly mounted on the first named slide and adapted to actuate said clutch, a third slide slidingly mounted on the second slide, a lever fulcrumed on the frame and adapted to engage and operate the said third slide, an actuating cam for said lever, a second cam,and a rod connected to the first-named slide and adapted to be actuated by the second ca'm to move said slides in the direction opposite to that in which they are moved by the first cam, substantially as set forth.

2. In a screw-cutting machine, the combination, with a stock sleeve adapted to carry the stock, a slide in which the said sleeve is mounted to tu rn, a clutch and levers for imparting a sliding motion to the said sleeve, a second slide for controlling the said clutch and fitted to slide on the said first named slide, a screwcarried by the said second slide and adapted to engage the first named slide, and a third slide fitted to slide on the second slide and carrying a screw adapted to engage the said second slide, substantially as shown and described.

3. In a screw-cutting machine, the combination, with a stock sleeve adapted to carry lthe stock, a slide in which the said sleeve is mounted to turn, a clutch and levers for iinparting a sliding motion to the said sleeve, a second slide for controlling the said clutch and fitted to slide on the said rst named slide, a Vscrew carried bythe said second slide and adapted to engage the first named slide, a third slide fitted to slide on the second slide and carrying a screw adapted to engage the said second slide, a lever for imparting motion to the said third slide, and a cam for actuating the said lever, substantially as shown and described.

e. In a screw-cutting machine, the combination, with a stock sleeve adapted to carry the stock, a slide in which the said sleeve is mounted to turn, a clutch and levers for imparting a sliding motion to the said sleeve, a second slide for controlling the said clutch and fitted to slide on the said first named slide, a screw carried by the said second slide and adapted to engage the first named slide, a third slide fitted to slide on the second slide and carrying a screw adapted to engage the said second slide, a lever for imparting motion to the said third slide, a cam for actuating the said lever, a second cam rotating in unison with the said first cam, and a rod IOO IIO

connected with the said first slide and acted on by the said second cam, substantially as shown and described.

5. ln a screw-cutting machine, the combination with a stock sleeve adapted to carry the stock, a slide in which the said sleeve is mounted to turn, a clutch and levers for imparting a sliding motion to the said sleeve, a second slide for controlling the said clutch and iitted to slide on the said first named slide, a screw carried by the said second slide and adapted to engage the first named slide, a third slide tilted to slide on the second slide and carrying a screw adapted to engage the said second slide, a rod or arml connected with the said first slide, and a revoluble cam for actuating the said rod or arm, to cause a return movement of the said slides, substany tially as shown and described.

6. A screw-cutting machine, provided with a stopping mechanism `comprising a lever adapted to rest on the stock from which the screws are cut, a second lever locked normally in place by the said Viirst named lever,

carriage to impartan intermittent reciprocatory movement to the same, a tapping mechanism borne on the carriage and adapted to form the thread of the screw, a slide having a lateral recess, said slide being mounted on the carriage and adapted `for longitudinal movement in a direction parallel to the feed of the stock, a holder carried by said slide and adapted to receive the tapped screw, means for imparting a forward movement to the holder when the same is in position. to receive the tapped screw, a rotating cutter mounted on the frame in front of the oarriage, a lever fulcrumed on the frame and adapted to engage the lateral recess in the slide when the same is in position in front of the cutter, and means for actuating said lever, whereby said slide is moved endwise to form the slot in the screw-head, substantially as set forth.

8. A stopping mechanism for screw-cutting machines comprising a clutch, a notched rod connected to said clutch and adapted to actuate the same, a retracting spring, a Worm on the machine shaft, a spring having one end in engagement with the notch of said rod and provided with a tooth adapted to engage the Worm, and a rod pivoted on the frame, one end of the rod beingadapted to rest `on the spring and hold the tooth thereof away from the Worm, the other end ot' said lever being weighted and adapted to be supported by the stock, substantially as set forth.

ADOLB METTLER.

Witnesses:

CHARLES RosENTHAL, F. W. BAoKEs. 

